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527 lines
21 KiB
HTML
527 lines
21 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>GDB/MI Tracepoint Commands (Debugging with GDB)</title>
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<meta name="description" content="GDB/MI Tracepoint Commands (Debugging with GDB)">
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<meta name="keywords" content="GDB/MI Tracepoint Commands (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="GDB_002fMI.html#GDB_002fMI" rel="up" title="GDB/MI">
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<link href="GDB_002fMI-Symbol-Query.html#GDB_002fMI-Symbol-Query" rel="next" title="GDB/MI Symbol Query">
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<link href="GDB_002fMI-Data-Manipulation.html#GDB_002fMI-Data-Manipulation" rel="prev" title="GDB/MI Data Manipulation">
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</style>
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</head>
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<body lang="en">
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<a name="GDB_002fMI-Tracepoint-Commands"></a>
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<div class="header">
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<p>
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Next: <a href="GDB_002fMI-Symbol-Query.html#GDB_002fMI-Symbol-Query" accesskey="n" rel="next">GDB/MI Symbol Query</a>, Previous: <a href="GDB_002fMI-Data-Manipulation.html#GDB_002fMI-Data-Manipulation" accesskey="p" rel="prev">GDB/MI Data Manipulation</a>, Up: <a href="GDB_002fMI.html#GDB_002fMI" accesskey="u" rel="up">GDB/MI</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="GDB_002fMI-Tracepoint-Commands-1"></a>
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<h3 class="section">27.17 <small>GDB/MI</small> Tracepoint Commands</h3>
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<p>The commands defined in this section implement MI support for
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tracepoints. For detailed introduction, see <a href="Tracepoints.html#Tracepoints">Tracepoints</a>.
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</p>
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<a name="The-_002dtrace_002dfind-Command"></a>
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<h4 class="subheading">The <code>-trace-find</code> Command</h4>
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<a name="index-_002dtrace_002dfind"></a>
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<a name="Synopsis-69"></a>
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<h4 class="subsubheading">Synopsis</h4>
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<div class="smallexample">
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<pre class="smallexample"> -trace-find <var>mode</var> [<var>parameters</var>…]
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</pre></div>
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<p>Find a trace frame using criteria defined by <var>mode</var> and
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<var>parameters</var>. The following table lists permissible
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modes and their parameters. For details of operation, see <a href="tfind.html#tfind">tfind</a>.
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</p>
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<dl compact="compact">
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<dt>‘<samp>none</samp>’</dt>
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<dd><p>No parameters are required. Stops examining trace frames.
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</p>
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</dd>
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<dt>‘<samp>frame-number</samp>’</dt>
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<dd><p>An integer is required as parameter. Selects tracepoint frame with
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that index.
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</p>
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</dd>
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<dt>‘<samp>tracepoint-number</samp>’</dt>
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<dd><p>An integer is required as parameter. Finds next
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trace frame that corresponds to tracepoint with the specified number.
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</p>
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</dd>
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<dt>‘<samp>pc</samp>’</dt>
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<dd><p>An address is required as parameter. Finds
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next trace frame that corresponds to any tracepoint at the specified
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address.
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</p>
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</dd>
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<dt>‘<samp>pc-inside-range</samp>’</dt>
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<dd><p>Two addresses are required as parameters. Finds next trace
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frame that corresponds to a tracepoint at an address inside the
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specified range. Both bounds are considered to be inside the range.
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</p>
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</dd>
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<dt>‘<samp>pc-outside-range</samp>’</dt>
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<dd><p>Two addresses are required as parameters. Finds
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next trace frame that corresponds to a tracepoint at an address outside
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the specified range. Both bounds are considered to be inside the range.
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</p>
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</dd>
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<dt>‘<samp>line</samp>’</dt>
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<dd><p>Line specification is required as parameter. See <a href="Specify-Location.html#Specify-Location">Specify Location</a>.
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Finds next trace frame that corresponds to a tracepoint at
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the specified location.
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</p>
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</dd>
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</dl>
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<p>If ‘<samp>none</samp>’ was passed as <var>mode</var>, the response does not
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have fields. Otherwise, the response may have the following fields:
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</p>
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<dl compact="compact">
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<dt>‘<samp>found</samp>’</dt>
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<dd><p>This field has either ‘<samp>0</samp>’ or ‘<samp>1</samp>’ as the value, depending
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on whether a matching tracepoint was found.
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</p>
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</dd>
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<dt>‘<samp>traceframe</samp>’</dt>
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<dd><p>The index of the found traceframe. This field is present iff
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the ‘<samp>found</samp>’ field has value of ‘<samp>1</samp>’.
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</p>
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</dd>
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<dt>‘<samp>tracepoint</samp>’</dt>
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<dd><p>The index of the found tracepoint. This field is present iff
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the ‘<samp>found</samp>’ field has value of ‘<samp>1</samp>’.
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</p>
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</dd>
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<dt>‘<samp>frame</samp>’</dt>
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<dd><p>The information about the frame corresponding to the found trace
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frame. This field is present only if a trace frame was found.
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See <a href="GDB_002fMI-Frame-Information.html#GDB_002fMI-Frame-Information">GDB/MI Frame Information</a>, for description of this field.
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</p>
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</dd>
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</dl>
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<a name="GDB-Command-51"></a>
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<h4 class="subsubheading"><small>GDB</small> Command</h4>
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<p>The corresponding <small>GDB</small> command is ‘<samp>tfind</samp>’.
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</p>
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<a name="g_t_002dtrace_002ddefine_002dvariable"></a>
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<h4 class="subheading">-trace-define-variable</h4>
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<a name="index-_002dtrace_002ddefine_002dvariable"></a>
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<a name="Synopsis-70"></a>
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<h4 class="subsubheading">Synopsis</h4>
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<div class="smallexample">
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<pre class="smallexample"> -trace-define-variable <var>name</var> [ <var>value</var> ]
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</pre></div>
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<p>Create trace variable <var>name</var> if it does not exist. If
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<var>value</var> is specified, sets the initial value of the specified
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trace variable to that value. Note that the <var>name</var> should start
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with the ‘<samp>$</samp>’ character.
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</p>
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<a name="GDB-Command-52"></a>
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<h4 class="subsubheading"><small>GDB</small> Command</h4>
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<p>The corresponding <small>GDB</small> command is ‘<samp>tvariable</samp>’.
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</p>
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<a name="The-_002dtrace_002dframe_002dcollected-Command"></a>
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<h4 class="subheading">The <code>-trace-frame-collected</code> Command</h4>
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<a name="index-_002dtrace_002dframe_002dcollected"></a>
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<a name="Synopsis-71"></a>
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<h4 class="subsubheading">Synopsis</h4>
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<div class="smallexample">
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<pre class="smallexample"> -trace-frame-collected
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[--var-print-values <var>var_pval</var>]
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[--comp-print-values <var>comp_pval</var>]
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[--registers-format <var>regformat</var>]
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[--memory-contents]
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</pre></div>
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<p>This command returns the set of collected objects, register names,
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trace state variable names, memory ranges and computed expressions
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that have been collected at a particular trace frame. The optional
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parameters to the command affect the output format in different ways.
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See the output description table below for more details.
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</p>
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<p>The reported names can be used in the normal manner to create
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varobjs and inspect the objects themselves. The items returned by
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this command are categorized so that it is clear which is a variable,
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which is a register, which is a trace state variable, which is a
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memory range and which is a computed expression.
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</p>
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<p>For instance, if the actions were
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</p><div class="smallexample">
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<pre class="smallexample">collect myVar, myArray[myIndex], myObj.field, myPtr->field, myCount + 2
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collect *(int*)0xaf02bef0@40
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</pre></div>
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<p>the object collected in its entirety would be <code>myVar</code>. The
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object <code>myArray</code> would be partially collected, because only the
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element at index <code>myIndex</code> would be collected. The remaining
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objects would be computed expressions.
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</p>
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<p>An example output would be:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb)
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-trace-frame-collected
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^done,
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explicit-variables=[{name="myVar",value="1"}],
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computed-expressions=[{name="myArray[myIndex]",value="0"},
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{name="myObj.field",value="0"},
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{name="myPtr->field",value="1"},
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{name="myCount + 2",value="3"},
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{name="$tvar1 + 1",value="43970027"}],
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registers=[{number="0",value="0x7fe2c6e79ec8"},
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{number="1",value="0x0"},
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{number="2",value="0x4"},
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...
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{number="125",value="0x0"}],
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tvars=[{name="$tvar1",current="43970026"}],
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memory=[{address="0x0000000000602264",length="4"},
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{address="0x0000000000615bc0",length="4"}]
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(gdb)
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</pre></div>
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<p>Where:
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</p>
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<dl compact="compact">
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<dt><code>explicit-variables</code></dt>
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<dd><p>The set of objects that have been collected in their entirety (as
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opposed to collecting just a few elements of an array or a few struct
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members). For each object, its name and value are printed.
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The <code>--var-print-values</code> option affects how or whether the value
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field is output. If <var>var_pval</var> is 0, then print only the names;
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if it is 1, print also their values; and if it is 2, print the name,
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type and value for simple data types, and the name and type for
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arrays, structures and unions.
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</p>
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</dd>
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<dt><code>computed-expressions</code></dt>
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<dd><p>The set of computed expressions that have been collected at the
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current trace frame. The <code>--comp-print-values</code> option affects
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this set like the <code>--var-print-values</code> option affects the
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<code>explicit-variables</code> set. See above.
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</p>
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</dd>
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<dt><code>registers</code></dt>
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<dd><p>The registers that have been collected at the current trace frame.
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For each register collected, the name and current value are returned.
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The value is formatted according to the <code>--registers-format</code>
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option. See the <code>-data-list-register-values</code> command for a
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list of the allowed formats. The default is ‘<samp>x</samp>’.
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</p>
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</dd>
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<dt><code>tvars</code></dt>
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<dd><p>The trace state variables that have been collected at the current
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trace frame. For each trace state variable collected, the name and
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current value are returned.
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</p>
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</dd>
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<dt><code>memory</code></dt>
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<dd><p>The set of memory ranges that have been collected at the current trace
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frame. Its content is a list of tuples. Each tuple represents a
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collected memory range and has the following fields:
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</p>
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<dl compact="compact">
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<dt><code>address</code></dt>
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<dd><p>The start address of the memory range, as hexadecimal literal.
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</p>
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</dd>
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<dt><code>length</code></dt>
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<dd><p>The length of the memory range, as decimal literal.
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</p>
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</dd>
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<dt><code>contents</code></dt>
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<dd><p>The contents of the memory block, in hex. This field is only present
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if the <code>--memory-contents</code> option is specified.
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</p>
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</dd>
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</dl>
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</dd>
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</dl>
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|
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<a name="GDB-Command-53"></a>
|
||
|
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<h4 class="subsubheading"><small>GDB</small> Command</h4>
|
||
|
|
|
||
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<p>There is no corresponding <small>GDB</small> command.
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||
|
|
</p>
|
||
|
|
<a name="Example-57"></a>
|
||
|
|
<h4 class="subsubheading">Example</h4>
|
||
|
|
|
||
|
|
<a name="g_t_002dtrace_002dlist_002dvariables"></a>
|
||
|
|
<h4 class="subheading">-trace-list-variables</h4>
|
||
|
|
<a name="index-_002dtrace_002dlist_002dvariables"></a>
|
||
|
|
|
||
|
|
<a name="Synopsis-72"></a>
|
||
|
|
<h4 class="subsubheading">Synopsis</h4>
|
||
|
|
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample"> -trace-list-variables
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>Return a table of all defined trace variables. Each element of the
|
||
|
|
table has the following fields:
|
||
|
|
</p>
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt>‘<samp>name</samp>’</dt>
|
||
|
|
<dd><p>The name of the trace variable. This field is always present.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>initial</samp>’</dt>
|
||
|
|
<dd><p>The initial value. This is a 64-bit signed integer. This
|
||
|
|
field is always present.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>current</samp>’</dt>
|
||
|
|
<dd><p>The value the trace variable has at the moment. This is a 64-bit
|
||
|
|
signed integer. This field is absent iff current value is
|
||
|
|
not defined, for example if the trace was never run, or is
|
||
|
|
presently running.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<a name="GDB-Command-54"></a>
|
||
|
|
<h4 class="subsubheading"><small>GDB</small> Command</h4>
|
||
|
|
|
||
|
|
<p>The corresponding <small>GDB</small> command is ‘<samp>tvariables</samp>’.
|
||
|
|
</p>
|
||
|
|
<a name="Example-58"></a>
|
||
|
|
<h4 class="subsubheading">Example</h4>
|
||
|
|
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample">(gdb)
|
||
|
|
-trace-list-variables
|
||
|
|
^done,trace-variables={nr_rows="1",nr_cols="3",
|
||
|
|
hdr=[{width="15",alignment="-1",col_name="name",colhdr="Name"},
|
||
|
|
{width="11",alignment="-1",col_name="initial",colhdr="Initial"},
|
||
|
|
{width="11",alignment="-1",col_name="current",colhdr="Current"}],
|
||
|
|
body=[variable={name="$trace_timestamp",initial="0"}
|
||
|
|
variable={name="$foo",initial="10",current="15"}]}
|
||
|
|
(gdb)
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<a name="g_t_002dtrace_002dsave"></a>
|
||
|
|
<h4 class="subheading">-trace-save</h4>
|
||
|
|
<a name="index-_002dtrace_002dsave"></a>
|
||
|
|
|
||
|
|
<a name="Synopsis-73"></a>
|
||
|
|
<h4 class="subsubheading">Synopsis</h4>
|
||
|
|
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample"> -trace-save [ -r ] [ -ctf ] <var>filename</var>
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>Saves the collected trace data to <var>filename</var>. Without the
|
||
|
|
‘<samp>-r</samp>’ option, the data is downloaded from the target and saved
|
||
|
|
in a local file. With the ‘<samp>-r</samp>’ option the target is asked
|
||
|
|
to perform the save.
|
||
|
|
</p>
|
||
|
|
<p>By default, this command will save the trace in the tfile format. You can
|
||
|
|
supply the optional ‘<samp>-ctf</samp>’ argument to save it the CTF format. See
|
||
|
|
<a href="Trace-Files.html#Trace-Files">Trace Files</a> for more information about CTF.
|
||
|
|
</p>
|
||
|
|
<a name="GDB-Command-55"></a>
|
||
|
|
<h4 class="subsubheading"><small>GDB</small> Command</h4>
|
||
|
|
|
||
|
|
<p>The corresponding <small>GDB</small> command is ‘<samp>tsave</samp>’.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<a name="g_t_002dtrace_002dstart"></a>
|
||
|
|
<h4 class="subheading">-trace-start</h4>
|
||
|
|
<a name="index-_002dtrace_002dstart"></a>
|
||
|
|
|
||
|
|
<a name="Synopsis-74"></a>
|
||
|
|
<h4 class="subsubheading">Synopsis</h4>
|
||
|
|
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample"> -trace-start
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>Starts a tracing experiment. The result of this command does not
|
||
|
|
have any fields.
|
||
|
|
</p>
|
||
|
|
<a name="GDB-Command-56"></a>
|
||
|
|
<h4 class="subsubheading"><small>GDB</small> Command</h4>
|
||
|
|
|
||
|
|
<p>The corresponding <small>GDB</small> command is ‘<samp>tstart</samp>’.
|
||
|
|
</p>
|
||
|
|
<a name="g_t_002dtrace_002dstatus"></a>
|
||
|
|
<h4 class="subheading">-trace-status</h4>
|
||
|
|
<a name="index-_002dtrace_002dstatus"></a>
|
||
|
|
|
||
|
|
<a name="Synopsis-75"></a>
|
||
|
|
<h4 class="subsubheading">Synopsis</h4>
|
||
|
|
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample"> -trace-status
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>Obtains the status of a tracing experiment. The result may include
|
||
|
|
the following fields:
|
||
|
|
</p>
|
||
|
|
<dl compact="compact">
|
||
|
|
<dt>‘<samp>supported</samp>’</dt>
|
||
|
|
<dd><p>May have a value of either ‘<samp>0</samp>’, when no tracing operations are
|
||
|
|
supported, ‘<samp>1</samp>’, when all tracing operations are supported, or
|
||
|
|
‘<samp>file</samp>’ when examining trace file. In the latter case, examining
|
||
|
|
of trace frame is possible but new tracing experiement cannot be
|
||
|
|
started. This field is always present.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>running</samp>’</dt>
|
||
|
|
<dd><p>May have a value of either ‘<samp>0</samp>’ or ‘<samp>1</samp>’ depending on whether
|
||
|
|
tracing experiement is in progress on target. This field is present
|
||
|
|
if ‘<samp>supported</samp>’ field is not ‘<samp>0</samp>’.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>stop-reason</samp>’</dt>
|
||
|
|
<dd><p>Report the reason why the tracing was stopped last time. This field
|
||
|
|
may be absent iff tracing was never stopped on target yet. The
|
||
|
|
value of ‘<samp>request</samp>’ means the tracing was stopped as result of
|
||
|
|
the <code>-trace-stop</code> command. The value of ‘<samp>overflow</samp>’ means
|
||
|
|
the tracing buffer is full. The value of ‘<samp>disconnection</samp>’ means
|
||
|
|
tracing was automatically stopped when <small>GDB</small> has disconnected.
|
||
|
|
The value of ‘<samp>passcount</samp>’ means tracing was stopped when a
|
||
|
|
tracepoint was passed a maximal number of times for that tracepoint.
|
||
|
|
This field is present if ‘<samp>supported</samp>’ field is not ‘<samp>0</samp>’.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>stopping-tracepoint</samp>’</dt>
|
||
|
|
<dd><p>The number of tracepoint whose passcount as exceeded. This field is
|
||
|
|
present iff the ‘<samp>stop-reason</samp>’ field has the value of
|
||
|
|
‘<samp>passcount</samp>’.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>frames</samp>’</dt>
|
||
|
|
<dt>‘<samp>frames-created</samp>’</dt>
|
||
|
|
<dd><p>The ‘<samp>frames</samp>’ field is a count of the total number of trace frames
|
||
|
|
in the trace buffer, while ‘<samp>frames-created</samp>’ is the total created
|
||
|
|
during the run, including ones that were discarded, such as when a
|
||
|
|
circular trace buffer filled up. Both fields are optional.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>buffer-size</samp>’</dt>
|
||
|
|
<dt>‘<samp>buffer-free</samp>’</dt>
|
||
|
|
<dd><p>These fields tell the current size of the tracing buffer and the
|
||
|
|
remaining space. These fields are optional.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>circular</samp>’</dt>
|
||
|
|
<dd><p>The value of the circular trace buffer flag. <code>1</code> means that the
|
||
|
|
trace buffer is circular and old trace frames will be discarded if
|
||
|
|
necessary to make room, <code>0</code> means that the trace buffer is linear
|
||
|
|
and may fill up.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>disconnected</samp>’</dt>
|
||
|
|
<dd><p>The value of the disconnected tracing flag. <code>1</code> means that
|
||
|
|
tracing will continue after <small>GDB</small> disconnects, <code>0</code> means
|
||
|
|
that the trace run will stop.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt>‘<samp>trace-file</samp>’</dt>
|
||
|
|
<dd><p>The filename of the trace file being examined. This field is
|
||
|
|
optional, and only present when examining a trace file.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<a name="GDB-Command-57"></a>
|
||
|
|
<h4 class="subsubheading"><small>GDB</small> Command</h4>
|
||
|
|
|
||
|
|
<p>The corresponding <small>GDB</small> command is ‘<samp>tstatus</samp>’.
|
||
|
|
</p>
|
||
|
|
<a name="g_t_002dtrace_002dstop"></a>
|
||
|
|
<h4 class="subheading">-trace-stop</h4>
|
||
|
|
<a name="index-_002dtrace_002dstop"></a>
|
||
|
|
|
||
|
|
<a name="Synopsis-76"></a>
|
||
|
|
<h4 class="subsubheading">Synopsis</h4>
|
||
|
|
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample"> -trace-stop
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>Stops a tracing experiment. The result of this command has the same
|
||
|
|
fields as <code>-trace-status</code>, except that the ‘<samp>supported</samp>’ and
|
||
|
|
‘<samp>running</samp>’ fields are not output.
|
||
|
|
</p>
|
||
|
|
<a name="GDB-Command-58"></a>
|
||
|
|
<h4 class="subsubheading"><small>GDB</small> Command</h4>
|
||
|
|
|
||
|
|
<p>The corresponding <small>GDB</small> command is ‘<samp>tstop</samp>’.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="GDB_002fMI-Symbol-Query.html#GDB_002fMI-Symbol-Query" accesskey="n" rel="next">GDB/MI Symbol Query</a>, Previous: <a href="GDB_002fMI-Data-Manipulation.html#GDB_002fMI-Data-Manipulation" accesskey="p" rel="prev">GDB/MI Data Manipulation</a>, Up: <a href="GDB_002fMI.html#GDB_002fMI" accesskey="u" rel="up">GDB/MI</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|